Vacuum Pressureless Sintering of Ti-6Al-4V Alloy with Full Densification and Forged-Like Mechanical Properties

Zhang, Ce; Lu, Boxin; Wang, Haiying; Guo, Zhimeng; Paley, Vladislav; Volinsky, Alex A.

doi:10.1007/s11665-017-3019-6

Cited by 24 publications

(8 citation statements)

References 35 publications

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“…Sintering of Ti6Al4V has been widely investigated in pressureless and pressure‐assisted powder metallurgy routes . Figure shows a visual summary of the commonly used sintering techniques in the processing of Ti6Al4V prealloyed powders.…”

Section: Resultsmentioning

confidence: 99%

“…Comparative chart of pressureless and pressure‐assisted sintering routes conventionally used for the densification of Ti6Al4V. A processing gap is identified and investigated with potential advantages for Ti nanofiller composites …”

Section: Resultsmentioning

confidence: 99%

“…Sintering of Ti6Al4V has been widely investigated in pressureless and pressure-assisted powder metallurgy routes. [8][9][10]15,[29][30][31][32][33][34][35][36][37][38][39][40][41] Figure 5 shows a visual summary of the commonly used sintering techniques in the processing of Ti6Al4V prealloyed powders. Among two common sintering regimes for the densification of the alloy (1) and (2), this work outlines the emergence of a third regime (3) denominated as a "processing gap" (<800 C).…”

Section: Significance Of Low-temperature Sintering Of Ti6al4vmentioning

confidence: 99%

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Ultralow Temperature Densification of a Titanium Alloy by Spark Plasma Sintering

et al. 2020

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Full densification of a Ti alloy (Ti6Al4V) is achieved at unprecedented low temperatures of 650 °C and 555 MPa by spark plasma sintering (SPS) without any sintering aid. The alloy demonstrates a globular equiaxed microstructure with comparable mechanical properties as that sintered at conventional high temperatures (950 °C, 60 MPa). In contrast with the diffusion‐driven sintering of the Ti alloy at conventional SPS conditions, the near‐full densification (99%) attained at low‐temperature/high‐pressure regimes is attributed to plastic deformation‐driven mass transport processes. Sintering pressures of 555 MPa result in a dislocation dense microstructure and the activation of compressive twins imparting lattice strains of up to 2.86 × 10−3, suggesting a 25% increase in lattice distortions as compared with those sintered at moderate pressures of 60 MPa. Depth‐sensing nanoscale indentation reveals the globular microstructure of the high‐pressure‐sintered alloy to retain its elastic modulus and hardness of 138 and 4.8 GPa, respectively, with <2% deviation from those sintered at conventional SPS temperatures. This energy‐efficient technique proposes an alternative to thermally exhaustive routines and presents an advantage for engineering titanium‐matrix composites with nanofillers and controlled reaction products by reducing processing temperatures by up to 300 °C.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Significance Of Low-temperature Sintering Of Ti6al4vmentioning

confidence: 99%

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Ultralow Temperature Densification of a Titanium Alloy by Spark Plasma Sintering

et al. 2020

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“…In such cases, it is easy to form precipitates, such as rutile and alumina [29]. Therefore, in our previous works [30,31], powder transfer and powder handing are taken under Ar atmosphere in the entire procedure to control the interstitial content, especially oxygen content. Correspondingly, the oxygen content of Ti-23Al-17Nb with comprehensive mechanical properties is below 1500 ppm [15].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Mechanical Properties of High Relative Density γ-TiAl Alloy Using Irregular Pre-Alloyed Powder

Yan

Yang

et al. 2021

Metals

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Preparing high relative density γ-TiAl alloy by pressure-less sintering at low-cost has always been a challenge. Therefore, a new kind of non-spherical pre-alloyed TiAl powder was prepared by the reaction of TiH2 powder and Al powder at 800 °C to fabricate high-density Ti-48Al alloy via pressure-less sintering. The oxygen content was controlled to below 1800 ppm by using coarse Al powder (~120 μm). The sintered densities ranged from 92.1% to 97.5% with sintering temperature varying from 1300 °C to 1450 °C. The microstructure of the sintered compact was greatly influenced by the sintering temperature. The as-sintered samples had a near-γ structure at 1350 °C, a duplex structure at 1400 °C, and a nearly lamellar structure at 1450 °C. To achieve full densification, non-capsule hot isostatic pressing was performed on the 1350 °C and 1400 °C sintered samples. As a result, high compressive strengths of 2241 MPa and 1931MPa were obtained, which were higher than the existing Ti-48Al alloys.

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“…Hence, a growing research effort is being dedicated to PM Ti alloys prepared by pressureless sintering from HDH powder [14,15]. Recently, the authors have achieved the preparation of PM Ti alloy with relative density of above 98% by pressureless sintering via the employment of fine HDH powder [16,17]. Although there are still residual pores in PM Ti alloy, subsequent plastic processing (e.g.…”

Section: Introductionmentioning

confidence: 99%

High-temperature plastic deformation behaviour of powder metallurgy Ti6Al4V alloy prepared from HDH powder

Wang

Yang

et al. 2021

Powder Metallurgy

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Powder metallurgy (PM) Ti6Al4V alloy was prepared from HDH alloy powder by vacuum pressureless sintering. To study its high-temperature deformation behaviour, isothermal compression testing was carried out with temperature range of 900-1050°C, strain rate range of 0.01-10 s −1 , and compression ratio of 60%. Based on the hot deformation data, the corresponding constitutive equation and hot processing map were clarified. The deformation activation energy for PM Ti6Al4V alloy was 606.5 kJ mol −1 . Its deformation instability zone was very small, locating in the range of 960∼990°C with strain rate >1 s −1 . PM Ti6Al4V alloy had large hot working window and good hot workability. The ideal hot processing domain was at 970-990°C and 0.05-0.01 s −1 . Besides, the domain at 1000-1040°C and 1-10 s −1 was also suitable for hot processing. This study proposed an effective guidance for the hot deformation (e.g. forging, extrusion, rolling) of PM Ti6Al4V alloy.

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Vacuum Pressureless Sintering of Ti-6Al-4V Alloy with Full Densification and Forged-Like Mechanical Properties

Cited by 24 publications

References 35 publications

Ultralow Temperature Densification of a Titanium Alloy by Spark Plasma Sintering

Ultralow Temperature Densification of a Titanium Alloy by Spark Plasma Sintering

Microstructure and Mechanical Properties of High Relative Density γ-TiAl Alloy Using Irregular Pre-Alloyed Powder

High-temperature plastic deformation behaviour of powder metallurgy Ti6Al4V alloy prepared from HDH powder

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